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RCC Structures Design

RCC Structures Design
As per I.S. 456 - 1978, the pH value of water shall be

Equal to 7
Not less than 6
Less than 6
Equal to 6

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RCC Structures Design
If the permissible compressive stress for a concrete in bending is C kg/m², the modular ratio is

2800/C
2800/C²
2300/2C
2800/3C

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RCC Structures Design
If a bent tendon is required to balance a concentrated load W at the centre of the span L, the central dip h must be at least

WL/P
WL/3P
WL/2P
WL/4P

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RCC Structures Design
If K is a constant depending upon the ratio of the width of the slab to its effective span l, x is the distance of the concentrated load from the nearer support, bw is the width of the area of contact of the concentrated load measured parallel to the supported edge, the effective width of the slab be is

K/x (1 + x/d) + bw
Kx (1 + x/l) + bw
All listed here
Kx (1 - x/l) + bw

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RCC Structures Design
In a doubly-reinforced beam if ‘c’ and ‘t’ are stresses in concrete and tension reinforcement, ‘d’ is the effective depth and ‘n’ is depth of critical neutral axis, the following relationship holds good

(t + c)/n = (d + n)/n
mc/t = (d - n)/t
(m + c)/t = n/(d + n)
mc/t = n/(d - n)

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RCC Structures Design
The stem of a cantilever retaining wall which retains earth level with top is 6 m. If the angle of repose and weight of the soil per cubic metre are 30° and 2000 kg respectively, the effective width of the stem at the bottom, is

54.5
52.5
51.5
53.5

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